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FAIR VALUE MEASUREMENTS: Fair Value Measurements Level 4 (Details) - USD ($)
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value, All Levels Transfers, Amount $ 0 $ 0
Money market funds [1] $ 62,012,000 146,308,000
Derivative Asset, Statement of Financial Position [Extensible Enumeration] Other  
Asset derivatives $ 3,000 0
Equity Securities, FV-NI $ 38,448,000 39,772,000
Derivatives Other  
Liability derivatives $ 19,719,000 16,259,000
Fair Value, Inputs, Level 1    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Money market funds [1] 62,012,000 146,308,000
Asset derivatives 0 0
Equity Securities, FV-NI 38,448,000 39,772,000
Other Assets, Fair Value Disclosure [1] 0 0
Liability derivatives 8,186,000 4,003,000
Fair Value, Inputs, Level 2    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Money market funds [1] 0 0
Asset derivatives 3,000 0
Equity Securities, FV-NI 0 0
Other Assets, Fair Value Disclosure [1] 0 0
Liability derivatives 11,533,000 12,256,000
Fair Value, Inputs, Level 3    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Money market funds [1] 0 0
Asset derivatives 0 0
Equity Securities, FV-NI 0 0
Other Assets, Fair Value Disclosure [1] 0 0
Liability derivatives 0 0
Fair Value Measured at Net Asset Value Per Share    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Other Assets, Fair Value Disclosure [1] 5,948,000 4,099,000
Idaho Power Company    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Money market funds 110,602,000 158,999,000
Idaho Power Company | Fair Value, Inputs, Level 1    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Money market funds 110,602,000 158,999,000
Idaho Power Company | Fair Value, Inputs, Level 2    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Money market funds 0 0
Idaho Power Company | Fair Value, Inputs, Level 3    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Money market funds $ 0 $ 0
[1] Holding company only. Does not include amounts held by Idaho Power.